The Hanna Instruments HI 3841 is a Medium Range Hardness (as CaCO3) Test Kit that
comes with 30 mL hardness MR reagent and 50 mL calibrated vessel. Water hardness has traditionally been defined as the
capacity of water to precipitate soap. The ionic species in the water causing the precipitation was later found to be
primarily calcium and magnesium. In the present, therefore, water hardness is actually a quantitative measure of these
ions in the water sample. It is also now known that certain other ion species, such as iron, zinc and manganese, contribute
to the overall water hardness. The Hanna Instruments HI 3841 measures and subsequent control of water hardness is essential
to prevent scaling and clogging in water pipes.